Abstract
It is assumed that the occurrence of forging defects is accounted for by examining the amount of critical compression and by determining the values of this factor, and so by judging whether the material used was of sound quality and whether the working conditions were right. To justify this reasoning, the notched specimens prepared from carbon, low alloy and alloy steels, were compressed by impact energy, and the relationship between the behavior of forging defects produced at the notch bottom and the value of compression amount was investigated.As the result, it has been ascertained that the critical impact compression amount has a close relation with individual metallurgical factors, such as material and conditions, depending on the external factors such as the working temperature and the working speed. Furthermore, this notch compression method has proved to be an effective means for understanding the tendency of flaw generation in the forging.
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